Umar, U., M. U. H. A. Rasyid, and S. Sukaridhoto. “Distributed Database Semantic Integration of Wireless Sensor Network to Access the Environmental Monitoring System”. International Journal of Engineering and Technology Innovation, Vol. 8, no. 3, June 2018, pp. 157-72, http://ojs.imeti.org/index.php/IJETI/article/view/755.